sunspot:
If you must use the datasheet view of the query just set the query type to Snapshot.
In the query design window, bring up the proerties window and right click in the empty area in the upper window. The properties window should say Query Properties. On the Recordset Type line select Snapshot and save your query.
When the query is opened, no one will be able to change data. Of course if others have access to the query in design mode they can easily change this back.
HTH,
Vic